Provided are an oil-gelling agent which is highly safe to living organisms and environment, shows a preferable texture in using, and has good gelling ability, and a thickened gel-like composition using said oil-gelling agent, as an oil-gelling agent capable of forming reverse worm-like micelles and a thickened gel-like composition. A combination of lecithin/sucrose fatty acid ester serves as an oil-gelling agent capable of forming reverse worm-like micelles of various oils. By using a three component mixture system consisting of lecithin/sucrose fatty acid ester/various oils, a thickened gel-like composition having a reverse worm-like micelle structure can be obtained. Thus, a good oil-gelling agent, which is highly safe to humans and environment, has a high stability over a long period of time and shows such a performance as required as an oil-gelling agent, and a thickened gel-like composition, which comprises said oil-gelling agent and an oil component and in which reverse worm-like micelles have been formed, can be easily provided.
